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Continuously cast steel blooms
Published:2013-07-07 15:20:55    Text Size:【BIG】【MEDIUM】【SMALL

Steel blooms and billets are the starting materials for production of seamless steel tubes. In addition to the production of tubes they can also be used to produce other metallurgical semi-finished products using hot forming (rolling, forging, pressing, etc.). Steel blooms are made of a square or circular cross section.

Steels

All steel is cast as killed. Chemical composition of steels corresponds to individual standards and steel grades.

Chemical composition boundary of steels of steel blooms is in the range:
The elements content in weight %
C
Mn
Si
Cr
Mo
Ni
V
S
P
min
0,05
0,3
0,1
0,05
0,05
min
0
max
max
max
1,2
2,5
1,3
2,5
1,1
3,40
0,8
0,035
0,035

The elements content in weight %
Cu
Sn
Al
Ti
B
Nb
N
O
min
max
max
0,40
max
0,040
0,005
0,050
0 
0,050
0 
0,001
0 
0,050
0 
0,01
0 
0,00035


Supply conditions and the surface of steel blooms

After casting blooms are not heat treated. The surface corresponds to the method of casting and meets the requirements that are included in the agreed technical delivery regulations.

Blooms of square cross-section
Square 
side
[mm]
Dimensional tolerance
[mm]
Obliqueness*
max
[mm]
Cross-section area
[sqmm]
Weight
[kg/m]
Edge of the bloom customization
[mm]
125
± 3
± 5
15 600
121,9
R = 2 mm ± 1 mm
150
± 3
± 6
22 420
175,5
R = 5 mm ± 1 mm
160
± 3
± 6
25 600
199,7
R = 10 mm ± 1 mm
180
± 3
± 7
32 100
252,7
R = 10 mm ± 1 mm
200
± 4
± 7
39 680
312,0
R = 10 mm ± 1 mm
225
± 5
± 9
50 170
394,0
45° / 15 mm
280
± 8
± 12
76 662
598,0
R = 45 ± 5 mm
* Obliqueness = difference of diagonals of the square

Blooms of circular cross-section
Square 
side
[mm]
Dimensional tolerance
[mm]
Ovality
[mm]
Cross-section area
[sqmm]
Metrová hmotnosť
[kg/m]
150
± 2
3
17 662
137,7
180
± 3
5
25 434
198,4
210
± 4
5
34 618
270,0
240
± 4
5
45 216
352,7
260
± 5
6
53 066
414,0
280
± 5
7
61 575
480,0

Lengths of steel blooms

Blooms and billets are available in lengths of 4000 - 9000 mm with length tolerance of + 50 mm. Straightness deviation is 1% of the length. Obliqueness of the front side is 5 °.

Marking of steel blooms

Each bloom is marked with heat number, steel grade code and stream number. The data is stamped or upon agreement written with non-washable paint on the front side of the bloom.

Laying of steel blooms

Square ones – in layers on the top of each other 
Circular ones – on special wooden pads or tied with steel tape.

Certificates for welded tubes

Certificates are issued according to DIN 50049 or EN 10204 – 2.2 standards or upon agreement.
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